Resolver params behavior in case of many output keys

[souenzzo]

How pathom handle parameters when a resolver has multiple output's?

• It should merge the parameters?
• It should merge the parameters, in the same order as declared in output ?
• It should have an p/params-for-attr, allowing us to access all parameters from all keys declared in output?

The current behavior is: it will only receive parameters from the key that 'triggered' the call on this resolver.

(pco/defresolver ab [env _]
  {::pco/params [:k]
   ::pco/output [:a :b]}
  {:a (:k (p/params env))
   :b (:k (p/params env))})

;; query
[(:a {:k 1})
 (:b {:k 2})]
;; result (in pathom2)
=> {:a 1, :b 1}

[souenzzo]

We can do params-for-attr without change anything in pathom(2)

(defn params-for-attr
  [{::pc/keys [resolver-data]
    ::p/keys  [parent-query]}]
  (let [output-key? (->> resolver-data
                      ::pc/output
                      eql/query->ast
                      :children
                      (map :dispatch-key)
                      set)]
    (into {}
      (keep (fn [{:keys [dispatch-key params]}]
              (when (and params (output-key? dispatch-key))
                [dispatch-key params])))
      (:children (eql/query->ast parent-query)))))